mineral
Likely tumbled orange calcite
Calcite (CaCO₃)
AI-generated identification · may be incorrectOpaque peach-orange, rounded and smoothly polished, with a waxy to vitreous luster. Calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage; the photo alone cannot confirm the identification.
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Physical properties
Opaque peach-orange, rounded and smoothly polished, with a waxy to vitreous luster. Calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage; the photo alone cannot confirm the identification.
Formation & geological history
Calcite forms in sedimentary and hydrothermal settings, including limestone deposits and mineral veins; it occurs from geologically recent to ancient formations.
Uses & applications
Tumbled calcite is mainly used for collecting and decoration; calcite also has major industrial uses in cement, lime, and as a filler.
Geological facts
Calcite effervesces in dilute acid and is easily scratched by a steel knife. Orange color commonly comes from trace impurities.
Field identification & locations
The small polished pebble is consistent with orange calcite, but similar-looking stones include carnelian and dyed minerals. Common sources include Mexico, the United States, and Brazil.
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